Comparative effects of codeine and morphine in man.
D002986:Clinical Trials as Topic; D003061:Codeine / Q000008:administration & dosage / Q000494:pharmacology*; D004361:Drug Tolerance; D006801:Humans; D008297:Male; D009020:Morphine / Q000008:administration & dosage / Q000494:pharmacology*; D011680:Pupil / Q000187:drug effects*; D019966:Substance-Related Disorders
D009020:Morphine; D003061:Codeine